Impacts of Gate Recess and Passivation on AlGaN/GaN High Electron Mobility Transistors

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In this study, the impacts of gate recess and passivation on AlGaN/GaN high electron mobility transistors (HEMTs) were investigated. The trap-related characteristics were studied in detail by several different measurements including dc current–voltage, current collapse, gate lag, and flicker noise characterizations. With a Cl2/Ar-recessed gate, drain current collapse factors ($\Delta I_{\text{max}}$) of ${\sim}37.5$ and ${\sim}6.9$% were observed before and after SiN passivation. The gate lag measurements showed that the lagging phenomena almost disappear with SiN passivation for both Cl2- and Cl2/Ar-recessed devices. However, the flicker noise measurements revealed distinct noise levels of devices with different processes even after passivation. As the gate voltage ($V_{\text{G}}$) changed from 2 to $-4$ V, the devices recessed by Cl2 exhibited lower drain noise current densities ($S_{\text{ID}}/I_{\text{D}}{}^{2}$ ranging from $2.8\times 10^{-14}$ to $1.7\times 10^{-12}$ Hz-1 at 1 kHz) than those etched by Cl2/Ar mixture gas ($S_{\text{ID}}/I_{\text{D}}{}^{2}$ ranging from $6.3\times 10^{-14}$ to $6.0\times 10^{-12}$ Hz-1 at 1 kHz), whereas the devices without the recess process showed the lowest noise levels ($S_{\text{ID}}/I_{\text{D}}{}^{2}$ ranging from $2.8\times 10^{-15}$ to $1.3\times 10^{-13}$ Hz-1 at 1 kHz). It was found that $S_{\text{ID}}/I_{\text{D}}{}^{2}$ increased monotonically when $V_{\text{G}}$ changed from 2 to $-4$ V. A bias dependence of the $1/ f^{\gamma}$ slope $\gamma$ was observed, and a relatively large variation in the range of ${\sim}1.1$ to 1.6 was found for devices recessed by Cl2/Ar mixture gas. The number fluctuation model was employed to explain the observed trends. The results also indicated that the surface traps play an important role in these devices.

収録刊行物

  • Japanese journal of applied physics. Pt. 1, Regular papers & short notes  

    Japanese journal of applied physics. Pt. 1, Regular papers & short notes 46(2), 478-484, 2007-02-15 

    Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics

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各種コード

  • NII論文ID(NAID)
    10018544630
  • NII書誌ID(NCID)
    AA10457675
  • 本文言語コード
    EN
  • 資料種別
    ART
  • 雑誌種別
    大学紀要
  • ISSN
    0021-4922
  • NDL 記事登録ID
    8650769
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A375
  • データ提供元
    CJP書誌  NDL  JSAP 
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